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Polymer-ceramic multilayer composites with high fracture toughness

高断裂韧性聚合物陶瓷多层复合材料

基本信息

批准号：
238906427
负责人：
Professor Dr. Andreas Hartwig
金额：
--
依托单位：
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung (IFAM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/238906427?language=en
关键词：
Polymer ceramic multilayer composites fracture

项目摘要

Two groups are working together in this research project and it is the aim to develop and understand the property-structure-relationships of tough layered composites consisting of polymer and ceramic layers. For this purpose, layered composites of adhesively bonded ceramic foils will be prepared. The innovative composites should have a stiffness and a strength on a similar level like the applied high-perfotmance ceramic but higher mechanical reliability and toughness. The composite properties should highly depend on strength and elongation at break of the used adhesives which will be varied systematically. Furthermore, the adhesives amount should be kept as low as possible. The adhesives will be based on cationically curing epoxy resins. In our previous work we found that the modification of epoxy resins with partially crystalline polyesterpolyols, mainly based on poly(caprolactone), improves fracture strength and elongation at break strongly. The combination is better than that of high end commercial adhesives although our materials are not systematically formulated. There are indications that the outstanding properties are mainly caused by a heterogeneous morphology of the polymerised adhesive, although they seem to be homogeneous on the macroscopic level. The structure of the poly(caprolactone) will be varied therefore systematically and these compounds will be applied then for the adhesives preparation. The selected polymer system is most sufficient for basic examinations as its properties can be adjusted by only minimal changes of the composition. If photochemical curing is applied at different temperatures, heterogeneity can be varied even with identical composition. This allows the separate examination of the influence of morphology and composition on the adhesives properties. Different layer thicknesses of the ceramic foils and adhesive layers will be examined in order to work out the influence of the adhesives and the ceramics materials as well as of the construction of the layered composite stacks on the composites mechanical properties. For this goal an extensive work program will be carried out covering the physical and mechanical characterisation of the ceramic materials, the newly developed thermosetting adhesive polymers and the prepared layered composites. A deep understanding of the relationship between the structural variations and the resulting polymer as well as properties of the composites is expected. Beside the experimental investigation specific material models will be generated and applied for numerical simulation. The crack growth at the polymer ceramics interphase will be in the special focus of the numerical calculations. Based on the numerical results, layered composites with optimised properties will be prepared. Comparison between the experimentally determined properties of the layered composites and the results of the FEM calculations will contribute to the verification of the developed structure property models.

两个小组正在共同努力，在这个研究项目中，它的目的是开发和理解的坚韧层状复合材料的聚合物和陶瓷层组成的性能-结构-关系。为此目的，将制备层状复合材料的粘结陶瓷箔。创新的复合材料应具有与所应用的高性能陶瓷相似的刚度和强度，但具有更高的机械可靠性和韧性。复合材料的性能应高度依赖于所用粘合剂的强度和断裂伸长率，这将系统地变化。此外，粘合剂的量应保持尽可能低。粘合剂将基于阳离子固化环氧树脂。在我们以前的工作中，我们发现，部分结晶聚酯多元醇，主要是基于聚（己内酯），环氧树脂的改性，提高断裂强度和断裂伸长率强烈。尽管我们的材料没有系统地配制，但这种组合比高端商业粘合剂更好。有迹象表明，突出的性能主要是由聚合粘合剂的不均匀形态引起的，尽管它们在宏观水平上似乎是均匀的。因此，聚（己内酯）的结构将系统地变化，并且这些化合物将随后用于粘合剂制备。所选聚合物系统最适合基本检查，因为其性能仅需通过最小的组成变化进行调整。如果在不同的温度下进行光化学固化，则即使使用相同的组合物，异质性也可以变化。这允许单独检查形态和组成对粘合剂性能的影响。将检查陶瓷箔和粘合剂层的不同层厚度，以计算出粘合剂和陶瓷材料以及层状复合堆叠的构造对复合材料机械性能的影响。为了实现这一目标，将开展广泛的工作计划，包括陶瓷材料的物理和机械特性，新开发的热固性粘合剂聚合物和制备的层状复合材料。深入了解的结构变化和所得的聚合物以及复合材料的性能之间的关系是预期的。除了实验研究之外，还将生成特定的材料模型并应用于数值模拟。聚合物陶瓷界面处的裂纹扩展将是数值计算的重点。基于数值结果，将制备具有优化性能的层状复合材料。实验确定的层状复合材料的性能和有限元计算的结果之间的比较将有助于验证开发的结构性能模型。